Suppress no get_vfo message for Icom rigs.

No hope of getting Icom to ever provide this ability

src/rig.c

@@ -3329,7 +3329,7 @@ int HAMLIB_API rig_get_vfo(RIG *rig, vfo_t *vfo)
 
     caps = rig->caps;
 
-    if (caps->get_vfo == NULL)
+    if (caps->get_vfo == NULL && RIG_ICOM != RIG_BACKEND_NUM(rig->caps->rig_model))
     {
         rig_debug(RIG_DEBUG_WARN, "%s: no get_vfo\n", __func__);
         ELAPSED2;